From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Graph comparing power loss for different exhaust systems on a Phantom engine.
| Identifier | ExFiles\Box 66\2\ scan0306 | |
| Date | 28th November 1927 | |
| POWER LOSS COMPARISON OF EXHAUST SYSTEMS ON PHANTOM ENGINE. ENGINE RE 25. COMPRESSION RATIO = 4.12 LONG DURATION INLET CAM. STANDARD INDUCTION SYSTEM. CURVES. ① MANIFOLD TO Le C 2432/6/7 & COMPLETE SILENCING SYSTEM (CUTOUT SHUT). ② MANIFOLD TO Le C 2432/6/7 & FRONT SILENCER ONLY. ③ COMPLETE STANDARD SYSTEM (CUTOUT SHUT). ④ STANDARD TWIN MANIFOLDS & FRONT SILENCER ONLY. ⑤ SAME AS ② BUT WITH MANIFOLD MODIFIED TO V 182. LOST B.H.P (FROM OPEN EXHAUST FIGURES) RPM OF ENGINE. | ||